Automatic motor stop



Dec. 30, 1 24. 1,521,013

I F. H. DOERR AUTOMATIC MOTOR STOP Filed April 29, 1922 3 Sheets-Sheet 1 9 J5 J! A '7" v ikaazrf Dec. 30, 1924.

. 1,521,013 F. H. DOERR AUTOMATIC MOTOR STOP 7 Filed April 29, 1922 3 Sheets-Sheet 2 Dec. 30, 1924. 1,521,0131

F. H. DOERR AUTOMATI C MOTOR STOP Filed April 29, 1922 s Sheets-Sheet 5 Patented Dec. 30, 1924;.

UNITED STATES} PATENT We; 1

FRED H. DQER-R, or GR-AJSID narrns, momenta, assrenoa T0 oniiiv'EY. TALKING. f MACHINE COMPANY, or: CHICAGO, rumors, aconronerrou or ILLINOIS.

[AUTOMATIC oron s'ror.

a lic t o filed April 2;), 192a Serial no. 557,415.

To all whom it may concern:

Be it known that I, FRED H. Donna, ajciti-' zen of the United States, residing at Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful Improvements in Automatic Motor Stops, of which the, following is a specification.

This invention relates to a new and improved automatic motor stop and more par; ticularly to a mechanism adapted to auto matically stop the motors of atalking machine upon cessation of movement of the tone arm at the end of a record.

As is well known in the art, the records of talking'machines comprise a spiral groove I which groove ceases at the end of the, playing portion of the record. It is desirable to provide automatic means for stopping the motor and consequentlythe rotationof the record when the stylus reaches. the end of the record groove.

Certain mechanisms have heretofore been used, such, for example, as that disclosed in my Patent No. 1,489A87, which cause a' brake to act upon the turn-table at the completion of the record. This method of stopping a machine is open to the objection that no means are provided for stopping the motor when the turn-table is removed from the machine for the purpose of oiling or inspecting the mechanism.

In order to simplify the operation of the apparatus, it is desirable to provide means whereby the stop mechanism may be disengaged by movement of the tone-arm. It is also desirable to provide meanswhereby the stop ine'chanism will not become operative when the sound boX is held over the outer edge of the record in placing it upon the record when starting to play.

Since for some purposes it may be temporarily undesirable to have the stop mechanism in operation, as, for example, when using a device forrepeating records, I have provided means whereby my stop mechanism maybe rendered inoperative. Since it may attimes be desirable to immediately stop rotation of the turn-table, other than at the end of a record, I provide a manually operable friction brake acting on the turntable. I Inthe preferred form, the operating lever for this brake also serves to release the motor stop mechanism.

' arm.

. It is an object of the present invention to provide an automatic s'topadapted to operate upon the motor and to positively stop the operation of the motor upon-cessation of movement of the traversing member or tone It is a further object'to provide a stop of this character in which cushioning means are interposed between thestop andthe motor so that the motor may not be injured by "I too sudden a cessationot movement.

It is a furthe object to-provid'e means of this character in which the stop may be re-' leased by movement of the traversing memberv or. tone arm. V It is also an object to provide means 7 whereby the mechanism. is rendered inoperative during a predetermined range 01f movement ot' the tone arm.

It is a'turther object to provide in con-' nection with such mechanism, manually operable means whereby the mechanism may be rendered inoperative.

Another object is to provide a manually operable means adapted to disengage the stop mechanism. V 7

An additional object is to provide an auxiliary friction brake acting upon the turntable and preferably operated by a member which also serves to release the stop mechanism.

Other and further objects will appear as the description proceeds. i

I have illustrated a preferred embodiment of my invention in the accompanying draw-"f I ings, in which- Figure 1 is a plan view showing atalking machine with my. mechanism applied there-' to, the turn-table being cut away to show the mechanism, the mechanism being shown in the stop position;

mechanism being in an operatingposition;

I e5v Figure is a view snnilar to Flgure 1 but showing a modified form ot the device, the

, therewith by guide stud 77.

The lever 17 has a second arm 19 having a rounded outer end 20,the purpose of which will be discussed hereafter.

The rack bar 13 is provided with a rack 21 which engages the recessed teeth of the quadrant 22, being held in engagement The quadrant is pivoted upon shaft 23 upon which is also pivoted the friction arm 24. This arm 24: is maintained in frictional engagement with the hub of the quadrant by means of the spring clip 25.

The-free end 26 of the friction arm 24; fits into an opening 27 in a downwardly deilected portion of the stop member 28 as best 25 shown in Figure 3. The stop member 28 is. pivoted upon the screw 29 fitting in stud 30. This stop member isprovided with the stop arm 31, having a down-turned out-er end, and in the form of device shown in Figure 1, it is also provided with the start ing arm 32, the latter having an upturned end. The member 28 is also provided with the spring receiving extension 33 which fits into a notch 3 1 in the limiting member 35. The spring 36 connects the portion 33 of the stop member and the. spring receiving extension37. oi? the control member 38, which member is also pivoted upon the screw 29. Thecontrol member is provided with a struck up lug 39 which fits in a notch 14.0

in the stop member and with an operating arm 60, as best shown in Figure 5.

The turn-table spindle 11 is provided with a small gear 42 meshing with the larger gear 4.3 which latter rotates about the stud 18. As best shown in Figure at, the larger gear wheel 43 is rigidly connected to the hub 41% I and the starwheel a5 is rigidly connected to the upper portion of this hub. The cam carrying member d6 rotates freely about the hub a4. between the gear 43 and star wheel s best shown in Figure 5,, this member is provided with the studs 17 and %8 upon which are pivoted the links 49 and carrying rollers 51 and 52 which latter UV engage the periphery of the star wheel 45. These rollers are maintained in engagement with the star wheel by the springs 53 and 51, the opposite ends of which are secured to the upturned portions and 56, respectively, of the member 46. The member i6 also carries the stop lug 5'7 and the canr58.

In the form of device shown in Figures 2 and 5, the link 16 is provided with the lug 59 which is adapted to engage the stop arm 31 when the tone arm is swung outwardly to the extreme limit of its movement. The control member 38 is provided with the control arm 60, the end of which is adapted to engage the portion 20 of lever arm 19 when the tone arm is swung adjacent the outer edge of the turn-table.

Referring now to Figure 1, the slide lever 61 is held in frictional engagement with the motor-board 62 by the heads of the studs 63, the studs fitting in elongated slots. The

outer end of this slide lever is provided with the handle 64 for manual operation. The inner end of the lever 61 is provided with the upwardly extending portion 65 adapted to engage the inner edge of the control arm 60. r v

' Referring again to Figure 1, the slide 66 is secured to the motor-board 62 by the studs 6'? which coact with the slots 68 to permit a limited movement of the slide. The slide is provided with the starting arm 69 adapted to engage the arm 32 ot the stop member 28. The brake member 70 is pivoted upon the slide 66 and is provided with the brake pad 71 and operating handle 72. The member 70 is also provided with the lug 73 adapted to engage the lug 7%; ot' the slide 66 when the brake is in the oil positions The spring 75, one end of which is conn ct-ed to the member 70 and the opposite end of the stud 76, secured to the motor-board, serves both to maintain the brake in either the on or oil" position and also to retain the slide 66 at one end of its normal movement.

ln'the operation of both forms of the device, the gear wheel 43 is rotated by the gear 42 upon the turn-table spindle 411. This wheel 13 carries with it in its rotation the star wheel 15. The member 46 is also carried with the wheel 43 in its rotation, due to the engagement of the cam rollers 51 and 52 with the star wheel. The stop. lug 57 and the cam 58 are thus rotated.

As the tone arm is moved inwardly by the spiral groove upon the record, the rack bar 13 is drawn outwardly. It thus serves to rotate the quadrant 22 in the counterclockwise direction about its pivot 23. The friction arm 24 is friotionally clamped to the quadrant and hence tends to swing with the quadrant in the counterclockwise direction. The end 26 of the friction arm engages the'stop member 28 and tends to ro tate that member in the clockwise. direction.

V wardly and consequently the friction arm 24' swung in the counterclockwise direction by the cam.

. So long as thetone arm is moving inis moving in the counterclockwise direction, the engagement of the arm 24 with the stop member 28 will move the stop arm '31 out of the path of stop lug 57'. When, however,

the inward movement of the tone, arm-ceases,

due to the stylus having reached the inner end of the record spiral, or when the tone arm is swung out from the record and re mains still, no movement will be transmitted through friction arm 24 to the stop arm, and the stop arm will remain in the positionin which it is placed by the cam- 58 until the gear 43 has completed a rotation and brought the lug 57 against the end of the arm. The rotation of the member 46 will thus be positively stopped. Further rotation of the gear 43 will be resisted by the spring held engagement of the rollers 51 and 52 with the cam surfaces of the star wheel 45. 7

It will be observed that these two rollers are staggered so that they engage different relative portions of the cam surfaces and will not simultaneously drop off the end of cams. This spring resistance will yieldingly stop the rotation of the gear wheel 43 and -con-.

sequently stop the motor driving the spindle 41.

When the tone arm is swung over the outer or beginning portion of the record, the cam will be brought to the position in which it is shown in Figure 2. It here engages the arm of the control member 38 and swings that arm in the clockwise direction. This movement of the control member puts a tension upon the spring 36, and consequently the spring yieldingly urges the stop member 28 to the limit of its movement with the lug 33 against the left side of the notch 34. This spring tension upon the stop member is sufficient to overcome the frictional action transmitted by the arm 24 so that as soon as the stop arm 31 clears the cam 58, the arm will be drawn by the spring back to the position in which it is shown in Figure 5. Consequently, while the cam 20 engages arm 60, the stop .mechanism will not operate regardless of whether or not the tone arm is moving inwardly. The engagement of lug 39 upon member 38 with the notch 40 in member 28 limits the relative movement between these two members, and together with spring 36 insures their normally moving as a unit.

Referring now to Figure 1, when the slide 61 is pulled outwardly by means of its handle 64, the inner upturned end 65 will pull outwardly upon the arm 60. This will have the same result as when that arm'is thrust outwardly by the cam 20. Consequently, pulling the slide to its outer position serves to put the automatic stop out of operation.

When the automatic stop is in the stopped position, the :arm 31 will be engaging the stop lug 57 as shown inFigu're 1. In order amount to disengage the arm 31 from the lug 57. If the turn-table has been stopped solely by the automatic stop, the lug 73 will be in engagement with the lug 74 and only the second movement of the lever '72 described will be necessary to start the machine.

The form of the device shown in Figures 2 and 5.is'identical with that of Figure 1 with the exception of the starting mechanism. In the form of the device shown in Figures 2 and 5, the machine is started by swinging the tone arm outwardly until the lug 59 engages the arm 31 and thrusts the latter out of engagement with the lug 57,

The formsof the device shown are tobe understood as illustrative only, and I reserve the right to make such changes and 'modifications' as come within the scope of the appended claims. 7

I claim: i I 1. In combination with a motor and a traversing member, stop mechanism for said motor adapted to impose a positive cushioned resistance upon the motor, and means adapted to operate the stop mechanism up on cessation of movement by the traversing member.

2. In' combination with a'motor and a traversing member, stop mechanism for said 7 motor adapted to impose a spring resistance upon the motor, and 'means adapted'jto operate the stop mechanism upon cessation of movement by the traversingmember.

3. In combination" with a motor and a traversing member, astop arm operated by said traversing member, a stop lug moved by said motor and having a spring connection therewith, and means whereby the stop arm engages the stop lug to stop the motor upon cessation of movement by the traversing member.

4. In combination with a motor and a traversing member, a stop arm yieldingly urged in one direction by movement of the traversing member, a member rotated by the motor, a second member carrying a stop lug, a yielding connection between said members whereby the second member is rotated by the first, a stop lug carried by the second member, and cam means operated by the motor and adapted to periodically movethe arm in the opposite direction and into engaging position relative to the lug.

5. In combination with. a motor and a traversing member, a stop arm yieldingly urged in one direction by movement of the traversing member, a member rotated by the motor, a second member carrying a stop lug, a yielding connection between said members whereby the second member is rotated by the first, a stop lug carried by the second member, and cam means carried by the secondmember and adapted to pcriodically move the arm in the opposite direction and into engaging position relativeto the lug.

6. In combination with amotor and a traversing member, two members mounted on a common axis, a rigid drive connection between the first member and the motor, a yieldingdrive connection between the two members, and means adapted to positively stop movement of the second member upon cessation of movement by the traversing member.

7. In combination with a motor and a traversing member, two members mounted on a common axis, a rigid drive connection between the first member and the motor, a star wheel carried by the first member, and spring pressed cam rollers carried by the second member in engagement with the star wheel, forming a yielding drive connection between the two members, and means adapted to positively stop movement of thesecond member upon cessation of movement by the traversing member.

8. In combination with a motor and a traversing member, a stop arm operated by said traversing member, a stop lug'moved by said motor, means whereby the stop arm engages the stop lug to stop themotor upon cessation of movement by the traversing member, and manually operable means adapted to disengage the stop arm from. the stop lug.

9. In combination with a motor and a traversing member, a stop arm operated by said traversing member, a stop lug moved by said motor, means whereby the stop arm engages the stop lug to stop the motor upon cessation ofmovement by the traversing -member, and means whereby said.

means is rendered inoperative through a prevent engagement between the stop arm and stop lug.

11. In a sound reproducing machine, a tone arm, a motor, a turn-table rotated by the motor, a stop arm operatively associated with the tone arm, a stop lug operated by the motor, mechanism whereby the stop arm engages the stoplug to stop the motor upon cessation of movement of the tone arm, and manually operable means adapted to prevent effective operation of said mechanism.

12. In a sound reproducing machine, a tone arm, a motor, a turn-table rotated by the motor, a stop arm operatively associated with the tone arm, a stop lug operated by the motor, mechanism whereby the stop arm engages the stop lug to stop the motor upon cessation of movement 01 the tone arm, manually operable means adapted to prevent effective operation of said mechanism, and a manually operable friction brake for the turn-table.

13. In a sound reproducing machine, a tone arm, a motor, a turn-table rotated by the motor, a stop arm operatively associated with the tone arm, a stop lug operated by the motor, mechanism whereby the stop arm engages the stop lug to stop the motor upon cessation of movement of the tone arm, and manually operable means adapted to, disengage the stop arm from the stop lug.

14. In a sound reproducing machine, a tone arm, a motor, a turn-table rotated by the motor, a stop arm operatively associated with the tone arm, a stop lug operated by the motor, mechanism whereby the stop arm engages the stop lug to stop the motor up on cessation of movement of the tone arm, a manually operable friction brake for the turn-table and a manually operable lever adapted to releasesaid brake and to disengage the stop arm from the stop lug.

Signed at Grand Rapids, Michigan, this 25th day of April, 1922. r

FRED n. Donna. 

